Published November 18, 2018

Motion Controlled Lamp!

This project controls an interior light using two Particle Photons to send and receive data from a motion sensor.

BeginnerFull instructions provided3 hours591

Things used in this project

Hardware components

Particle Photon

Solderless Breadboard Half Size

ControlEverything.com Relay Shield for Particle Photon I²C 8-Channel SPDT 10-Amp

Jumper wires (generic)

PIR Motion Sensor (generic)

USB-A to Mini-USB Cable

Software apps and online services

IFTTT Maker service

Google Sheets

Story

Have you ever walked into a room and it's pitch black and you can't find the light switch, well we have the solution for you! This project will turn on a lamp as your drunken self stumbles in the door looking for the light switch. It utilizes a PIR motion sensor and a relay connected to 2 Particle Photons connected via internet.

Details

The sensor is placed next to the door, when the door is opened, it triggers the sensors which sends a "Detected" event to the particle cloud using the first photon.

The second photon reads the event from the particle cloud and outputs power from the designated pins. The power is input into a relay which is spliced into an extension cord where the lamp is plugged in.

The code is easy to adjust so that we can change the delay of the lamp on time.

1 / 2 • Photon Setup

Demonstration Video

Figure 1: Event Logs over Time

https://docs.google.com/spreadsheets/d/1P5zMBW8kJ7VoTPAKfvT9CPRRgw-aCu9N0DzM-Fh0Bzk/edit#gid=0

Code

int inputPin = D0;    // Motion Sensor Input          
int ledPin = D7;      // LED to indicate if beam has been broken          
int pirState = LOW;   // Initial state of PIR sensor, no motion          
int val = 0;                    
int calibrateTime = 10000;      

void setup(){
  pinMode(ledPin, OUTPUT);
  pinMode(inputPin, INPUT);     
}

void loop(){
    if ( calibrated() )
  {
      readTheSensor();
      reportTheData();
  }
}

void readTheSensor() {
  val = digitalRead(inputPin);
}

bool calibrated() {
  return millis() - calibrateTime > 0;
}

void reportTheData() {
    if (val == HIGH) {
    if (pirState == LOW) {
        Particle.publish("Open_Door", "Detected");
        pirState = HIGH;
        setLED( pirState );
    }
  } else {
    if (pirState == HIGH) {
     
      pirState = LOW;
      setLED( pirState );
    }
  }
}

void setLED( int state )
{
  digitalWrite( ledPin, state );
}